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toll like receptor 4

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https://www.readbyqxmd.com/read/28092654/promoter-polymorphism-of-toll-like-receptor-4-is-associated-with-a-decreased-risk-of-coronary-artery-disease-a-case-control-study-in-the-chinese-han-population
#1
Dandan Sun, Liping Sun, Qian Xu, Honghu Wang, Jun Yang, Yuan Yuan
BACKGROUND Coronary artery disease (CAD) is considered a chronic inflammatory disease of the blood vessels. Toll-like receptor 4 (TLR4) is a transmembrane receptor involved in inflammatory reactions. The aim of this study was to determine the association between polymorphisms in the promoter region and 3'-untranslated region (3'-UTR) of TLR4, and the associated CAD risk. MATERIAL AND METHODS This study enrolled 424 participants with CAD and 424 controls without CAD. The polymorphisms in the promoter region and 3'-UTR of TLR4 were identified from the HapMap database, including rs10116253, rs10983755, and rs11536889...
January 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28090296/endotoxin-and-mechanical-stress-induced-epigenetic-changes-in-the-regulation-of-the-nicotinamide-phosphoribosyltransferase-promoter
#2
Venkateswaran Ramamoorthi Elangovan, Sara M Camp, Gabriel T Kelly, Ankit A Desai, Djanybek Adyshev, Xiaoguang Sun, Stephen M Black, Ting Wang, Joe G N Garcia
Mechanical ventilation, a lifesaving intervention for patients with acute respiratory distress syndrome (ARDS), also unfortunately contributes to excessive mechanical stress and impaired lung physiological and structural integrity. We have elsewhere established the pivotal role of increased nicotinamide phosphoribosyltransferase (NAMPT) transcription and secretion as well as its direct binding to the toll-like receptor 4 (TLR4) in the progression of this devastating syndrome; however, regulation of this critical gene in ventilator-induced lung injury (VILI) is not well characterized...
December 2016: Pulmonary Circulation
https://www.readbyqxmd.com/read/28088700/chlorogenic-acid-ameliorated-concanavalin-a-induced-hepatitis-by-suppression-of-toll-like-receptor-4-signaling-in-mice
#3
Yinglin Yuan, Xia Gong, Li Zhang, Rong Jiang, Junxia Yang, Bin Wang, Jingyuan Wan
Chlorogenic acid (CGA), one of the most abundant dietary polyphenolic compounds, has been reported to exhibit anti-inflammatory ability. However, the hepatoprotective effects and molecular mechanisms of CGA on concanavalin A (Con A)-induced hepatitis have not been explored. In the present study, we found that pretreatment with CGA dose-dependently inhibited the elevation of plasma aminotransferases and alleviated hepatic pathological damage as well as hepatocyte apoptosis in Con A-exposed mice. Additionally, CGA markedly suppressed the production of serum tumor necrosis factor (TNF)-α and interferon (IFN)-γ, alleviated the infiltration of hepatic macrophages, neutrophils, and activated CD4(+) T lymphocytes in Con A-primed mice...
January 12, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28088610/the-effects-of-voluntary-wheel-running-on-neuroinflammatory-status-role-of-monocyte-chemoattractant-protein-1
#4
Lindsay J Spielman, Mehrbod Estaki, Sanjoy Ghosh, Deanna L Gibson, Andis Klegeris
The health benefits of exercise and physical activity (PA) have been well researched and it is widely accepted that PA is crucial for maintaining health. One of the mechanisms by which exercise and PA exert their beneficial effects is through peripheral immune system adaptations. To date, very few studies have looked at the regulation of neuroimmune reactions in response to PA. We studied the effect of voluntary wheel running (VWR) on pro- and anti-inflammatory cytokine levels, patterns of glial cell activation and expression of immune receptors in the brains of female C57BL/6 mice...
January 11, 2017: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/28088520/palmitic-acid-increases-invasiveness-of-pancreatic-cancer-cells-aspc-1-through-tlr4-ros-nf-%C3%AE%C2%BAb-mmp-9-signaling-pathway
#5
Makena J Binker-Cosen, Daniel Richards, Brenda Oliver, Herbert Y Gaisano, Marcelo G Binker, Laura I Cosen-Binker
Pancreatic cancer (PC) is an aggressive malady with proclivity for early metastasis. Overexpression of toll-like receptor 4 (TLR4) in pancreatic ductal adenocarcinoma, the most common type of pancreatic malignancy, correlates to tumor size, lymph node involvement, venous invasion and pathological stage. Lipopolysaccharides (LPS) are natural TLR4 ligands that have been shown to increase the invasive ability of PC cells. However, rapid inactivation of circulating LPS and low systemic absorption of inhaled LPS from the bronchoalveolar compartment make other agonists such as saturated fatty acids more suitable to be considered for TLR4-related cell invasiveness...
January 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28088291/bcfa-suppresses-lps-induced-il-8-mrna-expression-in-human-intestinal-epithelial-cells
#6
Y Yan, Z Wang, J Greenwald, K S D Kothapalli, H G Park, R Liu, E Mendralla, P Lawrence, X Wang, J T Brenna
Branched chain fatty acids (BCFA) are components of common food fats and are major constituents of the normal term human newborn GI tract. Polyunsaturated fatty acids (PUFA) have been suggested to reduce the risk and development of inflammatory bowel diseases (IBD); however, little is known about the influence of BCFA on inflammation. We investigated the effect of BCFA on interleukin (IL)-8 and NF-κB production in a human intestinal epithelial cell line (Caco-2). Cells were pre-treated with specific BCFA, or DHA, or EPA, and then activated with lipopolysaccharide (LPS)...
January 2017: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/28087377/in-vivo-biodistribution-and-imaging-studies-with-a-99m-tc-radiolabeled-derivative-of-the-c-terminus-of-prothymosin-alpha-in-mice-bearing-experimentally-induced-inflammation
#7
Chrysoula-Evangelia Karachaliou, Charalampos Triantis, Christos Liolios, Lazaros Palamaris, Christos Zikos, Ourania E Tsitsilonis, Hubert Kalbacher, Wolfgang Voelter, George Loudos, Minas Papadopoulos, Ioannis Pirmettis, Evangelia Livaniou
Prothymosin alpha (ProTα) is a highly conserved mammalian polypeptide (109 amino acids in man) exerting in vitro and in vivo immunoenhancing activities. Recently, our team has developed a (99m)Tc-radiolabeled derivative of the C-terminal bioactive decapeptide of ProTα ([(99m)Tc]C1) and employed it in in vitro studies, the results of which support the existence of binding sites on human neutrophils that recognize [(99m)Tc]C1, intact ProTα as well as the C-terminal decapeptide of ProTα and presumably involve Toll-like receptor 4...
January 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28079228/attenuated-recovery-of-contractile-function-in-aging-hearts-following-global-ischemia-reperfusion-role-of-extracellular-hsp27-and-tlr4
#8
Lihua Ao, Yufeng Zhai, Chunhua Jin, Joseph C Cleveland, David A Fullerton, Xianzhong Meng
BACKGROUND: While cardiac functional recovery is attenuated in the elderly following cardiac surgery with obligatory global myocardial ischemia/reperfusion (I/R), the underlying mechanism remains incompletely understood. We observed previously that human and mouse myocardium releases heat shock protein (HSP) 27 during global I/R. Extracellular HSP27 induces myocardial inflammatory response and plays a role in post-ischemic cardiac dysfunction in adult mouse hearts. OBJECTIVE: This study was to determine the role of extracellular HSP27 and Toll-like receptor 4 (TLR4) in the attenuated functional recovery in aging mouse hearts following global I/R...
December 19, 2016: Molecular Medicine
https://www.readbyqxmd.com/read/28079156/a-mucin-like-peptide-from-fasciola-hepatica-instructs-dendritic-cells-with-parasite-specific-th1-polarizing-activity
#9
Verónica Noya, Natalie Brossard, Ernesto Rodríguez, L Sebastián Dergan-Dylon, Carlos Carmona, Gabriel A Rabinovich, Teresa Freire
Fasciolosis is a trematode zoonosis of interest in public health and cattle production. We report here the immunostimulatory effect of a 66 mer mucin-like peptide from Fasciola hepatica (Fhmuc), which synergizes with lipopolysaccharide (LPS) to promote dendritic cell (DC) maturation, endowing these cells with Th1-polarizing capacity. Exposure of DCs to Fhmuc in presence of LPS induced enhanced secretion of pro-inflammatory cytokines and expression of co-stimulatory molecules by DCs, promoting their T cell stimulatory capacity and selectively augmenting IFN-γ secretion by allogeneic T cells...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28077646/adenovirus-modulates-toll-like-receptor-4-signaling-by-reprogramming-orp1l-vap-protein-contacts-for-cholesterol-transport-from-endosomes-to-the-endoplasmic-reticulum
#10
Nicholas L Cianciola, Stacey Chung, Danny Manor, Cathleen R Carlin
: Human adenoviruses generally cause mild self-limiting infections but can lead to serious disease and even be fatal in high-risk individuals, underscoring the importance of understanding how the virus counteracts host defense mechanisms. This study had two goals. First, determine the molecular basis of cholesterol homeostatic responses induced by the early region 3 membrane protein RIDα via its direct interaction with the sterol-binding protein ORP1L. Second, determine how this interaction regulates innate immunity to adenovirus...
January 11, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28076322/aeroallergen-der-p-2-promotes-motility-of-human-non-small-cell-lung-cancer-cells-via-toll-like-receptor-mediated-up-regulation-of-urokinase-type-plasminogen-activator-and-integrin-focal-adhesion-kinase-signaling
#11
Chun-Hsiang Lin, Hui-Han Lin, Cheng-Yi Kuo, Shao-Hsuan Kao
House dust mite (HDM) allergens are one of the major causes leading to respiratory hypersensitiveness and airway remodeling. Here we hypothesized that a major HDM allergen Der p 2 could increase cell motility and invasiveness of non-small cell lung cancer (NSCLC) cells. Our results showed that low dose (1 and 3 μg/mL) recombinant Der p 2 protein (DP2) enhanced the migration and invasiveness of human NSCLC cell A549, H1299 and CL1-5, but nonsignificantly altered their growth. Further investigation revealed that integrin αV level was increased and its downstream signaling including focal adhesion kinase (FAK) and paxillin were activated in A549 cells exposed to DP2...
January 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28075616/role-of-cxc-chemokine-receptor-type-4-as-a-lactoferrin-receptor
#12
Yoshiharu Takayama, Reiji Aoki, Ryo Uchida, Atsushi Tajima, Ayako Aoki-Yoshida
Lactoferrin exerts its biological activities by interacting with receptors on target cells, including LDL receptor-related protein-1 (LRP-1/CD91), intelectin-1 (omentin-1), and Toll-like receptor 4 (TLR4). However, the effects mediated by these receptors are not sufficient to fully explain the many functions of lactoferrin. C-X-C-motif cytokine receptor 4 (CXCR4) is a ubiquitously expressed G-protein coupled receptor for stromal cell-derived factor-1 (SDF-1/CXCL12). Lactoferrin was found to be as capable as SDF-1 in blocking infection by an HIV variant that uses CXCR4 as a co-receptor (X4-tropic HIV), suggesting that lactoferrin interacts with CXCR4...
October 31, 2016: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28075473/spirulina-lipopolysaccharides-inhibit-tumor-growth-in-a-toll-like-receptor-4-dependent-manner-by-altering-the-cytokine-milieu-from-interleukin-17-interleukin-23-to-interferon-%C3%AE
#13
Hiromi Okuyama, Akira Tominaga, Satoshi Fukuoka, Takahiro Taguchi, Yutaka Kusumoto, Shiro Ono
Th17 cells and the cytokine they produce, interleukin (IL)-17, play an important role in tumor progression in humans and in mice. IL-6 and IL-23 are critical cytokines for the differentiation and propagation of Th17 cells, respectively. Bacterial lipopolysaccharides (LPS) are known to stimulate immune cells to produce such inflammatory cytokines. Contrary to Escherichia coli (E. coli) LPS, LPS from Spirulina has low toxicity and barely induces in vivo production of IL-6 and IL-23 in mice. We examined the antitumor effects of Spirulina LPS compared to E...
January 2, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28075222/expression-of-myd88-in-adipose-tissue-of-obese-people-is-there-some-role-in-the-development-of-metabolic-syndrome
#14
Ada M Cuevas, Mariana Lazo, Isabel Zuñiga, Fernando Carrasco, Jim J Potter, Veronica Alvarez, Marcos Berry, Fernando Maluenda, Mario Ferrario, Jeanne M Clark
BACKGROUND: The mechanism leading to the development of metabolic complications in obese individuals is not fully understood. Thus, the objective of this study was to examine differences in insulin resistance, inflammation, cytokine and adipokine levels, and expression of selected genes across obese individuals with different number of metabolic syndrome (MetS) components. METHODS: Forty obese individuals who underwent bariatric surgery, divided in three groups based on the number of components of MetS, in addition to abdominal obesity (0, 1, and 2-3 additional components), were studied...
January 11, 2017: Metabolic Syndrome and related Disorders
https://www.readbyqxmd.com/read/28073916/ceramide-cd300f-binding-inhibits-lipopolysaccharide-induced-skin-inflammation
#15
Emiko Shiba, Kumi Izawa, Ayako Kaitani, Masamichi Isobe, Akie Maehara, Koichiro Uchida, Keiko Maeda, Nobuhiro Nakano, Hideoki Ogawa, Ko Okumura, Toshio Kitamura, Toshiaki Shimizu, Jiro Kitaura
Lipopolysaccharide (LPS) triggers inflammatory responses; however, the negative regulation of LPS responses in vivo remains poorly understood. CD300f is an inhibitory receptor among the CD300 family of paired activating and inhibitory receptors. We have previously identified ceramide as a ligand for CD300f and shown that the binding of ceramide to CD300f inhibits IgE-mediated mast cell activation and allergic responses in mouse models. Here we identify the critical role of CD300f in inhibiting LPS-induced skin inflammation...
January 10, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28070538/lack-of-effects-of-toll-like-receptor-4-antagonists-on-the-reinforcing-effects-of-cocaine-and-remifentanil
#16
COMMENT
Takato Hiranita
No abstract text is available yet for this article.
December 2016: Journal of Alcoholism and Drug Dependence
https://www.readbyqxmd.com/read/28069966/inherited-human-irak-1-deficiency-selectively-impairs-tlr-signaling-in-fibroblasts
#17
Erika Della Mina, Alessandro Borghesi, Hao Zhou, Salim Bougarn, Sabri Boughorbel, Laura Israel, Ilaria Meloni, Maya Chrabieh, Yun Ling, Yuval Itan, Alessandra Renieri, Iolanda Mazzucchelli, Sabrina Basso, Piero Pavone, Raffaele Falsaperla, Roberto Ciccone, Rosa Maria Cerbo, Mauro Stronati, Capucine Picard, Orsetta Zuffardi, Laurent Abel, Damien Chaussabel, Nico Marr, Xiaoxia Li, Jean-Laurent Casanova, Anne Puel
Most members of the Toll-like receptor (TLR) and interleukin-1 receptor (IL-1R) families transduce signals via a canonical pathway involving the MyD88 adapter and the interleukin-1 receptor-associated kinase (IRAK) complex. This complex contains four molecules, including at least two (IRAK-1 and IRAK-4) active kinases. In mice and humans, deficiencies of IRAK-4 or MyD88 abolish most TLR (except for TLR3 and some TLR4) and IL-1R signaling in both leukocytes and fibroblasts. TLR and IL-1R responses are weak but not abolished in mice lacking IRAK-1, whereas the role of IRAK-1 in humans remains unclear...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28063877/myeloid-differentiation-protein-2-dependent-mechanisms-in-retinal-ischemia-reperfusion-injury
#18
Luqing Ren, Jianjian Tao, Huaicheng Chen, Yang Bian, Xi Yang, Gaozhi Chen, Xin Zhang, Guang Liang, Wencan Wu, Zongming Song, Yi Wang
Retinal ischemia-reperfusion (I/R) injury is a common pathological process in many eye disorders. Oxidative stress and inflammation play a role in retinal I/R injury. Recent studies show that toll-like receptor 4 (TLR4) is involved in initiating sterile inflammatory response in retinal I/R. However, the molecular mechanism by which TLR4 is activated is not known. In this study, we show that retinal I/R injury involves a co-receptor of TLR4, myeloid differentiation 2 (MD2). Inhibition of MD2 prevented cell death and preserved retinal function following retinal I/R injury...
January 4, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28063173/identification-of-highly-connected-hub-genes-in-the-protective-response-program-of-human-macrophages-and-microglia-activated-by-alpha-b-crystallin
#19
Inge R Holtman, Malika Bsibsi, Wouter H Gerritsen, Hendrikus W G M Boddeke, Bart J L Eggen, Paul van der Valk, Markus Kipp, Johannes M van Noort, Sandra Amor
The glial stress protein alpha B-crystallin (HSPB5) is an endogenous agonist for Toll-like receptor 2 in CD14(+) cells. Following systemic administration, HSPB5 acts as a potent inhibitor of neuroinflammation in animal models and reduces lesion development in multiple sclerosis patients. Here, we show that systemically administered HSPB5 rapidly crosses the blood-brain barrier, implicating microglia as additional targets for HSPB5 along with peripheral monocytes and macrophages. To compare key players in the HSPB5-induced protective response of human macrophages and microglia, we applied weighted gene co-expression network analysis on transcript expression data obtained 1 and 4 h after activation...
January 7, 2017: Glia
https://www.readbyqxmd.com/read/28062186/protective-effects-of-atorvastatin-against-morphine-induced-tolerance-and-dependence-in-mice
#20
Nasim Sadat Pajohanfar, Ehsan Mohebbi, Abolfazl Rad, Akbar Pejhan, Samad Nazemi, Bahareh Amin
[Background] In this study, we evaluated the effects of atorvastatin, a lipid-lowering medication on morphine-induced tolerance and dependence in mice. [Methods] Tolerance was induced by subcutaneous administration of morphine (20 mg/kg) to animals, twice a day for 9 days. Atorvastatin was given at the doses of 5, 10 and 20 mg/kg, 30 min before each morphine administration, once daily for 9 days. Hot plate test was employed to assess antinociceptive effect of morphine on days 1, 3, 5, 7 and 9. Dependence was evaluated by naloxone-precipitated withdrawal syndrome...
January 3, 2017: Brain Research
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